Terumo Kabushiki Kaisha

Toru Kawashima

Tadashi Fujii

Hiroyuki Yagami

Akira Mochizuki

Kazuyoshi Tani

Yoshinori Kadoma

Yoji Imai

Hiroshi Katsumata

Ryuichi Urakawa

An indwelling catheter is made of a blend of a plurality of polyurethane resins containing polyglycols having different molecular weights, or a polyurethane resin containing a plurality of polyglycols having different molecular weights. It shows a dynamic storage modulus of 1 GPa or more under a dry condition at 25&deg; C. and decrease in dynamic storage modulus when changed from a dry condition at 25&deg; C. to a wet condition at 37&deg; C., a decrease percentage of the dynamic storage modulus being less than 60% at the elapsed time of 20 seconds and 60% or more at the elapsed time of 1 minute after placed under the wet condition at 37&deg; C. Its Young's modulus is 50 kgf/mm or more under a dry condition at 25&deg; C., which reduces to 25 kgf/mm or less within 5 minutes when placed under a wet condition at 37&deg; C.

Indwelling catheter

A polymerization initiator composition controlling polymerization at interface, comprising a (thio)barbituric acid compound represented by the general formula I: ##STR1## wherein R.sup.1 is an alkyl group of 1 to 3 carbon atoms, R.sup.2 and R.sup.3 are independently hydrogen atom or an alkyl group of 1 to 3 carbon atoms, and X is oxygen atom or sulfur atom, and (a) a metal halide represented by the general formula, MY.sub.n wherein M is Cu or Fe, Y is halogen atom, and n is an integer of 2 when M is Cu or an integer of 3 when M is Fe, or (b) a halogen ion-forming compound and M.sup.m -forming compound wherein M is Cu or Fe and m is 2+ when M is Cu or 3+ when M is Fe, and a curable composition comprising the (thio)barbituric acid and radically polymerizable monomer.

Polymerization initiator composition controlling polymerization at

An ultrasonic coupler provided with an ultrasonic wave propagating member formed of a water-containing polymeric gel and a holder for accommodating said propagating member and fixing it to a probe, which ultrasonic coupler is intended to be interposed between a subject under test and an ultrasonic probe for transmitting and receiving an ultrasonic wave to and from the subject under test and characterized by the fact that said ultrasonic wave propagating member is a water-containing polymeric gel produced by integrally cross-linking an aqueous solution of a water-soluble polymeric compound with said holder inside said holder.

Ultrasonic coupler and method for production thereof

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Ashigarakami, Japan

Toru Kawashima